PHP 类的创建和实例 求过做业

已知一个类Pen，该类有私有成员属性：name,color,price，并且有一个方法可以将该类的私有属性打印出来，请创建该类并实例化。

<?php
class Pen{
  private $name;
  private $color;
  private $price;

  public function __construct($name = '',$color = '' ,$price = ''){
    $this->name = $name;
    $this->color = $color;
    $this->price = $price;
  }

  public function print(){
    echo 'name:'.$this->name.',color:'.$this->color.',price'.$this->price;
  }
}

$p = new Pen('iPhone 12 pro max','黑色','8888');
$p->print();